@misc{indiciae02add4c23f27,
  title = {Earthquakes in the United States, April-June 1981},
  author = {Carl W. Stover and J. H. Minsch and P. K. Dunbar and B.G. Reagor},
  year = {1982},
  doi = {10.3133/cir871b},
  url = {https://pubs.usgs.gov/publication/cir871B},
  note = {Source identifier: cir871B}
}